package com.dgut.staffmodule.entity;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import org.springframework.data.jpa.domain.Specification;
import org.springframework.util.StringUtils;

public class DepartmentQueryDTO {
	private String deptName;

	public String getDeptName() {
		return deptName;
	}

	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}

	public static Specification<Department> getSpecification(DepartmentQueryDTO departmentQueryDTO) {
		Specification<Department> spec = new Specification<Department>() {
			public Predicate toPredicate(Root<Department> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
				// 1.Predicate查询条件集合
				List<Predicate> list = new ArrayList<Predicate>();
				// 2.根据QueryDTO数据字段的值进行判读那以及条件的组装
				// 姓名
				if (departmentQueryDTO != null && !StringUtils.isEmpty(departmentQueryDTO.getDeptName())) {
					Predicate p1 = cb.like(root.get("deptName").as(String.class),
							"%" + departmentQueryDTO.getDeptName() + "%");
					list.add(p1);
				}

				// 3.Predicate查询条件集合的 size 创建对应的Predicate查询条件数组
				Predicate[] p = new Predicate[list.size()];
				// 4.CriteriaBuilder的and 函数组装 查询条件数组
				return cb.and(list.toArray(p));
			}

		};
		return spec;
	}
}
